关于gcc,g++编译选项

gcc中的-Wl,rpath

gcc编译链接动态库时,很有可能编译通过,但是执行时,找不到动态链接库,那是

因为-L选项指定的路径只在编译时有效,编译出来的可执行文件不知道-L选项后面的值,

当然找不到。可以用ldd <your_execute>看看是不有 ‘not found’在你链接的库后面,

解决方法是通过-Wl,rpath=<your_lib_dir>,使得execute记住链接库的位置

gcc -o foo foo.c -L/usr/local/lib -lfoo -Wl,-rpath,/usr/local/lib
 
gcc -o foo foo.c -L$(prefix)/lib -lfoo -Wl,-rpath=$(prefix)/lib

>> Unfortunately, there are at least three incompatible kinds of
>> command-line options that tell the compiler to instruct the linker to
>> save library paths in the executable:
>>
>> 	-Wl,-rpath,/path/to/dir		gcc, g++, FreeBSD, SGI, Sun compilers
>> 	-rpath /path/to/dir		Compaq/DEC, SGI compilers
>> 	-Rdir:dir:dir			Portland Group, Sun compilers

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转载自www.cnblogs.com/alix-1988/p/12213567.html
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